crissum


Also found in: Dictionary.

crissum

[′kris·əm]
(vertebrate zoology)
The region surrounding the cloacal opening in birds.
The vent feathers covering the circumcloacal region.
References in periodicals archive ?
Bright rusty crissum in one, less evident in second, and third with no color difference between belly and crissum, appearing similar to front view of female Brown-headed Cowbird (Molothrus ater).
Two with more extensive, bright, rusty crissum, most like P.
aberti characteristic for any of the young was the dark rusty crissum (under-tail coverts) of five [F.